Nikon Nikkor Z 20 mm f/1.8 S
5. Chromatic and spherical aberration
Chromatic aberration
The optical construction of the Nikkor Z 20 mm f/1.8 S features as many as three low dispersion elements. Photos below prove that they aren't just for decoration – longitudinal chromatic aberration is corrected properly. |
Lateral chromatic aberration could be described in similar terms and below you can see how the lens fared in that category on both types of detectors.
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The results are really impressive, especially when you take into account the parameters of the lens. After all you deal here with a fast ultra wide-angle lens and aberration, no matter what aperture you employ, is on the borderline between negligible and low level. That performance is a bit better than the perofrmance of the Nikkor AF-S 20 mm f/1.8G ED we praised so much.
| Nikon Z7, RAW, f/1.8 | Nikon Z7, RAW, f/11.0 |
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Spherical aberration
When you look at the first photo of this chapter you see that it's difficult to notice any traces of 'focus shift'. Still, when you examine out-of-focus circles of light reached before and after the focal point you can find some small differences, pointing at influence of spherical aberration. However, lack of focus shift and these very slight differences in appearance of circles of light make us say that the lens doesn't have any serious problems with that aberration.
| Nikon Z7, f/1.8, before | Nikon Z7, f/1.8, after |
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